US5125982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning hard contact lenses
Assignee: Senju Pharmaceutical Co Ltd
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Filing: 1991-08-13
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Granted: 1992-06-30
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Expires: 2011-08-13
Abstract
Abstract The object of the invention is to provide a method of cleaning a hard contact lens which is easy to use, excellent in the cleaning effect and then does not affect the lens material disadvantageously. The method of cleaning a hard contact lens is characterized in that the hard contact lens adhered with soil is immersed in a mixture of an aqueous solution of a permanganate salt and an aqueous solution of a mild reducing substance.
Inventors
- 👤 Ogata Kazumi
- 👤 Kazumichi Ushio
- 👤 Hisayuki Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:14
CPC Classifications
G; G02; G02C; G02C13/00; A; A61; A61L; A61L12/00; A61L12/08; A61L12/12; A61L12/124; C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0078; C11D3/39; C11D3/3942
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
37 words
A method of cleaning a hard contact lens characterized in that the hard contact lens is immersed in a mixture of an aqueous solution of a permanganate salt and an aqueous solution of a mild reducing substance.
Claim 2
Independent Claim
37 words
A method of cleaning a hard contact lens characterized in that the hard contact lens is immersed in a mixture of an aqueous solution of a permanganate salt and an aqueous solution of a mild reducing substance.
Claim 3
Dependent Claim
22 words
A method of cleaning a hard contact lens according to claim 1, wherein the mild reducing substance is a reducing organic acid.
Claim 4
Dependent Claim
38 words
A method of cleaning a hard contact lens according to claim 1 or 2, wherein the mild reducing organic acid is one or more substances selected from the group consisting of citric acid, tartaric acid and succinic acid.
Claim 5
Dependent Claim
22 words
A method of cleaning a hard contact lens according to claim 1, wherein the mild reducing substance is a mild reducing saccharide.
Claim 6
Dependent Claim
36 words
A method of cleaning a hard contact lens according to claim 1 or 4, wherein the mild reducing saccharide is one or more substances selected from the group consisting of xylose, glucose, mannose, galactose and ribose.
Claim 7
Dependent Claim
39 words
A method of cleaning a hard contact lens according to claim 1, 2, 3, 4 or 5, wherein a mixture of an aqueous solution of a permanganate salt and an aqueous solution of mild reducing substance contains a surfactant.
Claim 8
Dependent Claim
19 words
A method of cleaning a hard contact lens according to claim 6, wherein the surfactant is a nonionic surfactant.
Claim 9
Dependent Claim
39 words
A method of cleaning a hard contact lens according to claim 7, wherein the nonionic surfactant is one or more substances selected from the group consisting of polyglyceride, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether and polyoxyethylene alkylphenyl ether.
Claim 10
Dependent Claim
19 words
A method of cleaning a hard contact lens according to claim 6, wherein the surfactant is an anionic surfactant.
Claim 11
Dependent Claim
37 words
A method of cleaning a hard contact lens according to claim 9, wherein the anionic surfactant is one or more substances selected from the group of alkyl sulfonic ester, N-acyl amino acid and N-acyl methyl taurine salt.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |